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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '003133ff0ef869021ff755f41cc880ab8c89463242845f0a337bac0e51ce4e5b' 
  AND token = 'IW4/HuXw71FOkOnpcgqcY7D2OilIeukcHH5bCkVogj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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