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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36366f06bff28ba2dba4137f9af9a3da2c2c3002e842d6129b03df3de311ba9e' 
  AND token = 'eL3qIt423gBfsc9JGz9DNgtzxN7WqbDCUtJzEb2ePt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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