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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2030f05d1f743046b6995cab84737c1f72acbafd834aee18d721c05c5f12bbb4' 
  AND token = 'htW7bztBFQ/wBEWa5VGgwaie09k7UGlmeQECmbr9pZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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