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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b301bbc5b7c0285b403b06f77a0d52ca9b4d5bf414ca000d89b03565814fe0c9' 
  AND token = 'N5McDcjgdYsSWNcRuTExXA+s56LZywsUxqgXyFvoq5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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