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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '05dfc464d4bc74ff9669951605eab3af1c8551874b43a9469e71c6c2e89c2b26' 
  AND token = 'dQNEMwPvQqu4zMex6dwzG7Ob19FFv9jev6VylTnfswk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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