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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e041ccaafeb24125e47522b5743d25ea6a442ca03d5b25025371963e046d7913' 
  AND token = 'KdQ+/opNuCA/QmS8kT4MlQYJenhORmNaPwElIx7Fcjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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