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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d3ff4c889270f87a75f62da861f0cc548e626a58b056ba40dd94aab306c746d' 
  AND token = '7vflXj6uhL7NiA8o76nesdVxJ2sKGM2jPSMOEX3V/pY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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