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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a9afef992b9a497071b978ebe61dcedff14d1fe769c34ceab51178f6cda1c68' 
  AND token = '4+no9A7fYOnF6/bLBHgcMalH/Zhs4on9W+yBpSa2qFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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