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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8454865df48239f8bf1b893d1d6c6c698ce3c77736e1f2f3c93ca1f1c4887d63' 
  AND token = 'ItgnJTisxKllCA3IJl/3WcFyMnImX1317/fX7hbS7ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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