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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f6a919b10e8d98119468eb2dd8e0959b5f8643cf410bdf6a35e9a79c6561eb6' 
  AND token = 'L1bvLJmxPRwGHQRMALToxo267JgSj+rdGCgDXy2keWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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