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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef4b2b61f6d353688aff12cfca762e040985eb9d539e192afd3dcd986d39631d' 
  AND token = 'vR5k25XxIuJ/Km2M5E8vpmKRSH/7wW7k5nNJ7H97Rbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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