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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a6188af847453eb1612d3efa467eceaa080babe3c5a5be0ab070979f805a9a7' 
  AND token = '5JgLq4TpAd+4v/m721oCRIu9YB9ja0jeCqP8L4Q1NE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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