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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f520c08a207d8ba3f0efcc4bffb9a19ef4e1e266759b08e43710c6c5d5233a6' 
  AND token = 'DnQTKAv6pnwxf12+EUudC6KhnB70U8J8R6aj6XbMjCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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