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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fe7625c76d16c714aa31a64e799d20c217cb05f2f19e11b5c35469c0b4ffd6f' 
  AND token = 'T5zeUX0jNu7t2xGBOvtdnO/yGrex50+UtFtUXGVcAj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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