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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48d7282d2bebc462d761fa27b127cc0080ae9a2a1be8d2768327db96f067db2f' 
  AND token = '7rr9Hd6tjSZrfXwgLJvIp2Z1+6YUiP4+n+AsvcgK4Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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