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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b845cbce38b0f66ec4e539f54129101bdc2fbc98927f1d9799743a9deb523a4' 
  AND token = 'APGzn8LwnyFmpTtDq4rNu6dvtwu46cn1RA0owrzI5EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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