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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1bab0b5a229be08d919063a2f9a75ccc2d959025d0eef97cca796044346ff341' 
  AND token = 'uluQEs/gLFifp3gIelmrXZogVKnD1opEMZHXWSyaX1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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