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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '014df8441148ec4f9015e5d8931cc44f0bb65233a4bed1ef2e90e094794bbc60' 
  AND token = '/kaKDO0cv2jAvGddmvU9wcyCafh/rDLyqgvZKyik4pA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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