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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0449f266b58a4e531822d80852fe0a758fc55c6c3d113d489b3e353498cd0e8' 
  AND token = 'fKqmYEF8zl8/fsImXFc9mc2iLQZr13QBfSYMr8e0JmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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