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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbde687f6747fdde8f23612ef5d97afe7949528f5676a3c3b982017f3362f84b' 
  AND token = 'CIS1VtkCqzdvA4sU4VLcKm9zplnCpHi3KHSclc1WuY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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