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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b957d37de227dc2d2dbe43ff646cd86dcab135cc61b450793ae454cdeeb4461a' 
  AND token = '4EsQxFGwoyzlajlMBdwNwYsw4R0JlRj75T5t0qyutn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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