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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0a8fd401835a953e05a58f624bd627de0955058ee910a5b7427a6338641684f' 
  AND token = 'pu2Qaq9rhj59+3G3k9tO2la1QPpcX0GYMegA+t3Q8i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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