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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ae6f60179c238b495f8b130accce9f288e26011c2b27b6ff1e698082200e6ee' 
  AND token = 'BOu3zNOao7TP5YWnoi3LAK061NIqxJg8FKIoGIj3CKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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