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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '191e4aaab0057bfed54d34c66f8f08ff980d81ac818ec3dc29a63e42d31f8046' 
  AND token = 'W9znmFGQAHg9G1czPRJWUOUztL2WQXkf6LZxj35xpSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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