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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae88e9bb009c4fa2b717701315ca4482a7816e629bf0e045c5a2441ba823d7ff' 
  AND token = 'tPJw+vCf+NFGelEIMs+5mb9r6mrezlplKTv1RDWpW0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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