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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7fb85ec2c2dc0917a29ace6c9b0089a357c093a75039a8aca4a9ad28e9f130a' 
  AND token = 'fPTiZmdJMHLyc2PaqkJ3x35r6ObH/b8OtEK7aiopvZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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