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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '531631bbcb36a228350d3451889a1dd879a9cb48159af3e469ecc56171f1d0ce' 
  AND token = '5NkR1mQw/hsNIqNJ4BfPT5zN7ykC9Epp+/kvaw7iAiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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