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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a03e957bac9bae124834b48f24a334899d4f026200c0e8b1d13b3fc4dc1e04d' 
  AND token = 'yvROcE1sN23vh3EINF67YALJag6dF3ukj5sF4nyZ6vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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