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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '035e2ded2fd2a9c562793d2bb2753bbafa1dfe4dd56efd9513726eee80bdf51d' 
  AND token = 'KdKDjtB2xal5liL9pdOdN3d+9jQVkSRIvGwmsodugr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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