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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db5bc93f3aa900590d2bb4b53b9b0c24a3e54f3ccecf93f836b9e278544a39cb' 
  AND token = 'Io9+MsmxGRpilFLyHqkjmQAkp1I4Y0yPs9dNLoM2BTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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