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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9844c57a712c00d1bb751d6400fe0182afd9f911699ba09015cc2c2409f707bc' 
  AND token = '2zvytvTuUf8u9nQDtE3hUG8BdxWcyITeAaNShqGHQoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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