SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3bf29d6024645195721cf7f66ded93a915f59fa8d3b66ac94f1a850d7b39f41e' 
  AND token = 'Z2W6mEGFPXI0bvtFlEvoZA5R2AhXhqCtHi/ERPcGb5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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