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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e43e1f92d14c3255455735be051ff8a6e8ad50905e3a5d2ae99f999f073139f' 
  AND token = 'Nfrmn4W12pKJNiKffTdZhj8Edhq5K5ReCWBHpVKeoa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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