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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '587c2ea0f0aa1d6617478b2abb3e89da426ff1f86a50d1783633ac5e07b6ea20' 
  AND token = '1l+d4zB7O1DoTUHNbv73vLxAwGOlUlnyFLvlJIPGyes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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