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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'efa7c0ae9d1d05d9a552b83c84800b0a5c0bed6d27bdadaf19e20f8a94951b8e' 
  AND token = 'nmXBoB00Y+bGfY2tcKJsk2086PPfENiuYeKMEZ5PzGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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