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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5324d8b1ff0043a4c9a8ccfe9a16d5ba006d691d9c37da39487bc09f45479fc' 
  AND token = 'd25qaRu0Bd5Gr5XHLh6iqDdYY0EqiMwaCFdAE5eqpWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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