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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '319445c0b5d32c3934f73cc1567e32df48d85625a583ae305f9643ba46fa18d2' 
  AND token = 'P59oGR0c3KqUYqOmMSQzEjEbXmemRSOl4EWtYVjd52c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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