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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7edaea4b918bdf2a466c383daa1486bb0de018b5be2b9e8cce3f39491a1de77' 
  AND token = 'DE//BS0dQLwEKJIPTek/ywFG4Q5atVKj6bDkjozN5hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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