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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aaded43d40b8b33f80f9b3e2a6b18976086824d7e843473cdb9088ff23cb2339' 
  AND token = 'h+eiLRQPVnWWiBT6hWNOO5rrKeNxIwE5IOKltfDMK4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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