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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35ed23a33490a3ae4c6f1eb326b5b88458403255b63ce54315663bbe7baf2cf0' 
  AND token = 'rLgwvoem2pGQyoD/hCh1n/SfTiXte91B5GQl20GEsoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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