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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c6caf74e5797b314f05d2da35e9ed7b61086ac6569fc18586c757ba8c4dc79f' 
  AND token = 'YFfkTXtmLLyQLNFE+pDDjNEetBNOunk2+7fcZG0TPcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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