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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36644c79541eeb455e2950df1b0c736e519f16e2809000c40ef6d9954d5f5238' 
  AND token = 'd8lOsnEXf9URB9v/Na2NJGdPI9SLN+vMVIUWLUVzDcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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