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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c191fafc2cbafeac685d55de8a10ed5b7c9b7942d24978aa711fca872b0b2b0' 
  AND token = '9ALS8o7yKx4T+6rVVOpNArvLTkXbcNgzmmCqZ6Yc/ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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