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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0daeb3dfa1e61fd4fa0d289f7ed8277b0733583d060b150dd716d2983dd0409' 
  AND token = 'okuTQ82LLswpdj/5SKCgXEjDpXFsdn2f6yAh3wAIswM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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