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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07eff0b937a291e5dc0f76066018306c15a5b363a96f311e42482f90f34ae714' 
  AND token = 'wKAMhXEyEaFwOX7jKY/z7QiAPo6vRkOkXODX7LIwMLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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