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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00eb47e777012a8ebc1aa97cf38e3d777f8c2435efe57419cdd6e84c62a52960' 
  AND token = 'BJdI1usDQN+ruoBed77XVr+zhn/M7Tph9ENH+dpyfOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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