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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76cba65ffcee8a98e2ae2d8bf04aaffa3a813ce228841f16989d133146d95c19' 
  AND token = '86qvUAZM7R1o+DoVZmXdUE7QT4M3/qkPR4IvQI7AENU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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