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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de052c840222b266b1d92c611281fbf87950055c89b7faaf01680ebaba4a6410' 
  AND token = 'ZI/CWkmtmdoNZWJsTqK+ZQmcZ8WWzdoI8LrcAx6AS/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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