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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8096a53d96859676a7de80a72e24e7c4fc33fb9eaf8c75fcf10261c79372431e' 
  AND token = '4Dk3RmXYLp/56WGiecIZPG5dMs6gqH1k+aiY3DrSiGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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