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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f1d6df33759963c6e0f6f3a6676aa18766d2b4c2f504f35fc4411015bd80efe' 
  AND token = 'fLtPUD6dAWPZSFxkKq92ftPXKFqpbS0BxBjPykQCUJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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