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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd51dc3c1dff1d97d5a8922043c442aede0f771bb4a54423510832ce1ef0cbe65' 
  AND token = 'bTKuqKbkU2Oh/AhnABKNlbNM8ISYLmFbAOcqxlkNxS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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