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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0163ea661403f815eff1560abff0ce140d3e5d58994c4c6246eef1ca53a802a1' 
  AND token = '1cYAW3EwGS94LtNHflmg+iwkGFzLaI2kEBZmyKy4D8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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