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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '940a6d3cfc6a1c90715d97d8f2d04d65cd53db1eb31c980ef7dae8b0b6a30e86' 
  AND token = 'mH0GIWDeaBWCgHrptFkZpfWRrab+6kOd9eP5oyl8XFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}