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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c81e722e32e0ef59bbe563416b4b3d608783bc14d54f57ee2a5aa3ef197af2f' 
  AND token = 'dWo8gAoxZjEX09wF6At2wcun2Vo83JZejogRaXh94rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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