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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52c47abee37a4cf715c1954ca84ba9bcc2065fd15ee6d19766969afb8ee94459' 
  AND token = 'ddjqKt12Ub9rXiEav+a6RDpJLflnZ0kOG63G9nuCOW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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