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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '625ee82651e48a3d12082f01f81c41ff0620d5e82067ade83cf485331c6d1ba0' 
  AND token = '00WD/VilAk+O209ZXdQAxwYcTwivUn0Ssu4pLStVtdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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