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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b864687499ad432ad5ab4baec60c940285d2b6f4dab9068f55fc3b3e3ddc5c0' 
  AND token = 'rN113O/JlVHTc/Ulu4KENuFgz2KZ8iHpOOQEiU4q2n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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