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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf12a5dd126b8818ea8146f30660081d9c3d35de714b775768cb8352d8ee9a1f' 
  AND token = 'Zkn0gZu3JyK4IkOKQ7v0NFlMP+DAeocvTLMN1AFDsGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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