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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6bbdd048c9e9e6024e981e72fe0006683367ca6b763fa21c7683378330551d6' 
  AND token = 'ek4ABLNNQj5EMAt9k/muwpRBkJAYcY05x63HWKF4WYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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