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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7233f4682ac7996e0f36cd9aaaefacf6a17f3a4e92b6a1c8115f17229ed016b9' 
  AND token = 'np3Gx0M88Lx0bykSIPhy5bSCLvSlcNLqaKuMbtN8bLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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