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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '387e991a1a97beed4761a4d4c7f98e9b70942e4264dfc544870b06c6cb7af827' 
  AND token = '/aeT1UQiAnrZXCfIdbFIgZ5L/WlxL9rTgr2q/orcfAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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