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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1dbd27bf91566c72ced6446215ede039c4c23c2b13aaef69fa1860febe5e5d1e' 
  AND token = 'DO6DZOgBYzgBA2KPIvgPOQHfntMica9KAWcgvLVMps4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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