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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e35f5bcb91592355555ceb4861b392fbed3c06b8992f8afe72765913ba73520f' 
  AND token = 'uUcW0HL8WYYjZ5/nNt406YzEPKaYxZ1Y16puVC7ns/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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