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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '884ac817063278ea31188793e5e3b0b1696006f383e8fe8a00dabdd3949a0b46' 
  AND token = 'gU14y4v+LVR2+lCkELH61qDe85Ei+2EVmWLCioxnB4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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