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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '744f8c96ad7755007a2e8df3ee39f64f30d2f46efca045a795d79276d70c2e49' 
  AND token = 'lAYEEFcjmaug7j16vAmLFN6PVKx70xHE0r9MdFcYjuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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