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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba3385deb11a2c014000e082ffe40f028ef4fcf906d129943d88ca600774bb77' 
  AND token = 't2LcdB3DdRg3mFijzIMQ0yOnd4MwM7K63anpM6feQzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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