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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ead0400ca42c71feb2f467e850c159a1202ab4b987d5d4d84b1aa5b962e8a27f' 
  AND token = 'XSs/21J6GicSr/G/IkqcQFFzXYJ9R5aUbNb3yKj3+e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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