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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a6810f0005ab6d83f9bca6555060def6f48fc5e2399c4588d53404283a6459a' 
  AND token = 'u7UCltbuxrYO9LZgqQXOx+ObqjDsRbj8zNt6q2OBMQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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