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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10e976f7b5dd9c9fd52b23f2d61be02117d40225204f4061e082871661dedfaf' 
  AND token = 'foLBHWL89IerEvGk8RdM9Oh8qmEd9WofLYHZCUBHqGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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