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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a891aff60511b0a2709ee65973a8a9add886facda9917537a99c5a6d25b9480' 
  AND token = 'Ur09NIK1SyYcu+aS9/bxuLeDUr4nqaquIpgPM3xESCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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